[imp] PHP ERROR: json_encode(): Invalid UTF-8 sequence in argument [pid 6338 on line 242 of "/usr/share/pear/Horde/Serialize.php"]

[ANANT S ATHAVALE]

Dear List,

Getting the error written in Subject.  Enclosed is the trace.  Please
suggest.

Jan 12 2014 10:42:53 DEBUG: HORDE [imp] SQL  (0.0007s)
        SELECT alarm_id, alarm_uid, alarm_start, alarm_end,
alarm_methods,
          alarm_params, alarm_title, alarm_text, alarm_snooze,
alarm_internal
          FROM horde_alarms WHERE alarm_dismissed = 0 AND
((alarm_snooze IS NULL
          AND alarm_start <= '2014-01-12T05:12:53') OR
alarm_snooze <=
          '2014-01-12T05:12:53') AND (alarm_end IS NULL OR
alarm_end >=
          '2014-01-12T05:12:53') AND (alarm_uid IS NULL OR
alarm_uid = '' OR
          alarm_uid = 'smk at isac.gov.in') ORDER BY alarm_start,
alarm_end [pid 6338 on line 319 of
"/usr/share/pear/Horde/Db/Adapter/Mysqli.php"]
Jan 12 2014 10:42:53 WARN: HORDE [imp] PHP ERROR: json_encode(): Invalid
UTF-8 sequence in argument [pid 6338 on line 242 of
"/usr/share/pear/Horde/Serialize.php"]
2014-01-12T10:42:53+05:30 DEBUG: HORDE 1. IMP_Ajax_Application->send()
/var/www/horde/services/ajax.php:67
2. Horde_Core_Ajax_Application->send()
/var/www/horde/imp/lib/Ajax/Application.php:125
3. Horde_Core_Ajax_Response->sendAndExit()
/usr/share/pear/Horde/Core/Ajax/Application.php:237
4. Horde_Core_Ajax_Response_HordeCore->send()
/usr/share/pear/Horde/Core/Ajax/Response.php:55
5. Horde::escapeJson()
/usr/share/pear/Horde/Core/Ajax/Response/HordeCore.php:59
6. Horde_Serialize::serialize() /usr/share/pear/Horde.php:219
7. Horde_Serialize::_serialize() /usr/share/pear/Horde/Serialize.php:66
8. json_encode() /usr/share/pear/Horde/Serialize.php:242
9. Horde_ErrorHandler::errorHandler()
-- 
           Regards
            Anant
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